Sunda International Industrial is a professional manufacturer for sim card solution in China,we are the first one to develop and research dual sim card for mobile in this field several year agao and now we have the wider range or dual sim card than others and our products win great reputation from our customers.Right now we are the first one to release our Free sim card for iphone unlocking in China,soon after we release the sim card for GSM phones and 3G phones,now we are the first one to release the sim card for 3g iphone.

How to unlock and use this sim unlock card:

1. Prepare your SIM card, turbo SIM and pen knife.
2. Cut your SIM card according to the turbo SIM IC chip.
3. Place your SIM card together with turbo SIM and put in to your mobile phone. Now your mobile phone is unlocked.

IC/Microchip used:

The unlocking card adopt C8051-F300, the difference betweeen F300 and 304 is the work frequency of CPU. F300 with high work frequencty and with much bigger programmable space. F300 with more precise work frequencty, about 25M. Through softwares reform, SIM cards STK funciton can be started up normally.

Virtue: High CPU work frequency, rapid identify card speed, infrequent machine freezed / died.